Spindle reversing device for drill presses



Oct. 19, 1948. P. M. LLOYD 2,451,756

- SPINDLE REVERSING DEVICE FOR DRILL PRESSES Filed Dec. 28, 1945 2Sheets-Sheet 1 It 1 I 1 I m 1 I PaulMLloyJ Oct. 19, 1948. P. M. LLOYDSPINDLE REVERSING DEVICE FOR DRILL PRESSES 2 Sheets$heet 2 Filed Dec.28, 1945 IN V EN TOR.

PazilMlloya' Patented Oct. I 19, 1948 SPINDLE REVERSING DEVICE F DRILLPRESSES Paul M. Lloyd, Glendale, Calif.

Application December 28,1945, Serial No. 637,704

1 Claim. (01. 74-205) My invention relates to an improvement inspindle-reversing attachments for drill-presses to adapt same fortapping etc. The objects of my invention are to provide an inexpensive,readily home work shops, this being accomplished inpart by the adaptionof friction disc elements, eliminating the cost of machined gears.

I attain these and other objects by mechanism illustrated in theaccompanying drawings, in which- Figure 1 is a vertical elevation of theentire device, including -a partial sectional view of internal parts.

Figure 2, a sectional view of the device as it appears looking down onFigure 1 at A-AA.

Figure 3, a perspective view of a conventional bench drill press, withthe device IIa attached in approximate position for operation.

Similar numerals refer to similar parts throughout the 3 views. Capitalletters refer to positions and spaces. I On Fig. 1, I shaft, 2 sheaveand I beveled disc element are keyed securely in one unit and rotatingclockwise constantly with the drill press motor. 3 sheave, beveled discelement are both securely fixed to 4 sleeve shaft, free-running on shaftI and within bearing of housing II, making 3, 5 and 4 a fixed idlingunit when not in operation.

In the forward or clockwise operation, pressure is applied by theoperator at shift lever I6, moving same to position F, I0 being securelyfixed to rocker arm I2 through shaft II exerts some proportionalpressure on unit I, 2, I through adjusting screw 9, engaging 5 with Ithrough the medium of idling composition friction member 6, thereby,uniting the complete vertical assembly on shaft l in one clockwiserotating unit, in which through sheave 3, a V-belt will drive drillpress spindle in forward or tapping operation.

In Fig. 1,v upon moving II) to neutral or nonoperating position N, thepressure of 9 is released from I, permitting unit I, 2 and I, to drop bygravitation, closing space X, and releasing the friction of 6 with 5 andI, rendering the complete forward operating position in-operative.

During the forward F, and neutral N positions thepressure on unit III,II, I2 and adjusting screw I3 has been released from shaft I4, collar I5and composition friction member I6, both being fixed securely to I4,thereby rendering unit l4, I5 and I6 in-operative, as indicated at Y, Fi1.

To reverse sheave 3 to a counter-clockwise rotationremembering thatsheave 2 is constantly rotating clockwise, exert pressure on I6 movingit to position R including its fixed unit II, I2 and I3 which'in turnexerts pressure on fixed unit I4, I5 and I6, engaging I6 with both 5 andI, I already traveling clockwise will drive 5 and its unit 4 and. 3 inthe opposite direction by reversing the already engaged member I6,thereby rotating 3 in the opposite direction from 2. Unit I4, I5 and I6is free running in bearing 8a.

I8, 2|, 22 and 2B are housing screws; I9 and I9a are screws to securelyattach drill press post bracket 20 to housing Ila; 23, 24 and 25 arekeys for affixing their adjacent parts securely; 26, 21 areball-bearings fitted freely in shaft ends; Fig. 2, Z indicates thecenter of a drill press post.

What I claim is:

In a spindle-reversing device, the combination of a housing, driving anddriven shafts co-axially aligned and journaled in said housing, twooppositely disposed beveled disc elements upon said driving shaft, onemounted securely to the driving shaft, the other attached to a drivensleeve member rotatable co-axially with said driving shaft and extendingalong said driving shaft through a housing bearing to receive a securelyattached sheave, a beveled composition friction member interposedbetween said beveled disc elements. a second beveled composition memberbeing mounted securely on a free running shaft within a third bearing insaid housing at right angles to driving shaft, said beveled member andfree running shaft being free longitudinally to engage with beveled discelements when pressure is exerted on said free running shaft parallel tothe axis of said third bearing, thereby, actuating said beveled discelements in contrary rotation, and means applied manually and variablyupon the driving shaft to effect the engagement and disengagement ofsaid beveled friction member with disc elements.

PAUL M. LLOYD.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS F 'ournier Apr. 4, 1918

